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Develop and maintain scalable backend services for NFT marketplaces and Web3 infrastructure using Go. Integrate blockchain networks, implement account abstraction, and design efficient indexing strategies for high-load systems.
Xsolla is a global commerce company with robust tools and services to help developers solve the inherent challenges of the video game industry. From indie to AAA, companies partner with Xsolla to help them fund, distribute, market, and monetize their games. Grounded in the belief in the future of video games, Xsolla is resolute in the mission to bring opportunities together, and continually make new resources available to creators. Headquartered and incorporated in Los Angeles, California, Xsolla operates as the merchant of record and has helped over 1,500+ game developers to reach more players and grow their businesses around the world. With more paths to profits and ways to win, developers have all the things needed to enjoy the game.
For more information, visit xsolla.com.
We are looking for a Middle/Senior Backend Engineer who is passionate about building scalable blockchain infrastructure and Web3 services to join our Xsolla ZK team. The best candidate will be someone who thrives in a fast-paced, highly collaborative, and exceptionally dynamic setting and is excited to develop backend systems that power NFT marketplaces, smart wallets, and blockchain-based gaming infrastructure.
Strong backend development skills in Go are essential, along with experience in building high-load distributed systems and working with databases. The ability to design resilient microservices architecture and integrate with blockchain networks will be key to your success in this role.
If you're passionate about building the infrastructure layer for next-generation gaming and love working on cutting-edge blockchain technology that enables gamers to truly own their digital assets, we would love to hear from you!
Xsolla ZK is building a cross-game infrastructure that empowers gamers to freely trade and use their digital assets without barriers. The backend team develops services for:
Xsolla Bazaar — NFT marketplace for trading digital assets across Ethereum, Polygon, and Xsolla ZK chains
Web3 Backpack — Smart wallet backend with account abstraction (ZK SSO 4337)
Blockchain Services — Event scanners, transaction processors, and Web3 connectors
BFF Layer — Backend-for-Frontend services orchestrating complex Web3 operations
Tech Stack:
Language: Go (go-ethereum, ethkit, idiomatic concurrency patterns)
Databases: MongoDB, PostgreSQL, Redis
Message Queue: NATS, RabbitMQ, Kafka
API: REST, WebSocket, gRPC, OpenAPI (Swagger)
Blockchain Infrastructure:
ZK Stack / ZKsync Era: EraVM, zksolc/zkvyper compilers, system contracts, bootloader, native Account Abstraction on zkSync-family chains
Account Abstraction (ERC-4337): EntryPoint (v0.6–v0.8), UserOperation lifecycle (prepare→sign→submit→confirm), bundler and paymaster roles, ERC-7562 validation rules, ERC-6492 signature validation for undeployed accounts
Ethereum L1: go-ethereum, abigen for smart contract bindings, RPC and indexer semantics
Smart Contracts: Solidity, ERC-20/721/1155, modular account standards (ERC-7579 / ERC-6900), session keys (ERC-7710 / ERC-7715)
Signature Schemes: EIP-712 typed data, ERC-1271 contract signatures, WebAuthn/passkey (P-256)
Infrastructure: Docker, Kubernetes, GitLab CI/CD, Graylog
Key Technical Challenges:
ZK Stack Integration: Working with EraVM execution environment, native Account Abstraction on zkSync-family chains, double resource accounting (EE gas + native computational resources), L1↔L2 communication via ZKsync Gateway, finality and reorg behavior
Account Abstraction Backend Services: Implementing the ERC-4337 UserOperation lifecycle, integrating with bundlers and paymasters, handling gas estimation failure modes and counterfactual deployment
Smart Contract Interaction: Generating Go bindings via abigen, handling factory dependencies for contract deployment, implementing EIP-712 transaction signing and ERC-1271 signature verification
Session Keys & Delegated Permissions: Supporting scoped, time-limited, contract-allowlisted authority (ERC-7710 / ERC-7715) for gasless, prompt-free gameplay transactions
Event Processing: Building blockchain event scanners for multiple chains (Ethereum, Polygon, Xsolla ZK), implementing reorg handling and transaction finality tracking
High-Availability Architecture: Designing resilient microservices for NFT marketplace and wallet backends with real-time WebSocket updates
Develop backend services using Go with ethkit and go-ethereum for Ethereum interactions and RPC integration
Integrate with ZK Stack infrastructure: work with EraVM, system contracts, and L1↔L2 messaging
Build and maintain wallet backend indexing integrations for real-time token balance tracking and webhooks (via internal indexer or third-party providers)
Design and implement APIs for NFT marketplace and orderbook services, including on-chain order matching and settlement flows
Implement smart contract interaction layer using abigen-generated Go bindings for ERC-20/721/1155 tokens
Build Account Abstraction (ERC-4337) backend support: UserOperation submission and monitoring, paymaster gas-sponsorship logic, session-key issuance and revocation
Develop blockchain event scanners with reorg handling for Ethereum, Polygon, and Xsolla ZK chains
Implement BFF (Backend-for-Frontend) services orchestrating complex multi-chain operations
Design efficient caching and indexing strategies for on-chain data using Redis and MongoDB
Write comprehensive tests including integration tests with local ZKsync test environment
Document APIs using OpenAPI/Swagger specification
Monitor and troubleshoot production systems, handle blockchain-specific edge cases (stuck transactions, gas estimation)
Required:
2+ years of commercial experience with Go
Strong understanding of MongoDB and PostgreSQL (query optimization, indexing)
Experience with Redis for caching and session management
Knowledge of message queues (NATS, RabbitMQ, or similar)
Experience designing and implementing REST APIs with OpenAPI/Swagger
Understanding of microservices architecture patterns
Experience with Docker and container orchestration basics
Proficiency with Git and GitLab CI/CD
Solid understanding of distributed systems concepts
Preferred:
Experience with Ethereum/EVM blockchain integration:
Working with go-ethereum library and RPC nodes
Smart contract interaction via ABI bindings (abigen)
Understanding of transaction lifecycle, gas estimation, nonce management
Knowledge of ZK Stack / ZKsync Era:
EraVM execution model and differences from EVM, including native Account Abstraction on zkSync-family chains
System contracts (ContractDeployer, NonceHolder, etc.)
L1↔L2 communication, bridging, and finality/reorg behavior
Working knowledge of ERC-4337 Account Abstraction:
EntryPoint contract and the UserOperation lifecycle
Bundler and paymaster roles, gas estimation failure modes
Session keys and delegated permissions (ERC-7710 / ERC-7715)
Familiarity with signature schemes: EIP-712 typed data, ERC-1271 contract signatures, WebAuthn/passkey signers
Exposure to AA infrastructure providers (any of: Sequence, thirdweb, Privy, Dynamic, Turnkey, Pimlico, Alchemy, Biconomy, ZeroDev, Safe{Core}) for wallet, indexer, or transaction-relay integrations
Knowledge of token standards (ERC-20, ERC-721, ERC-1155) and their implementation details
Experience with blockchain event processing: event scanning, reorg handling, finality
Understanding of DeFi concepts and NFT marketplace mechanics
Experience with Kubernetes for container orchestration
We are passionate about fostering a supportive environment for our team, so we prioritize the physical, mental, and emotional well-being of our employees and their families through a comprehensive Benefits Program. This includes medical, dental, and vision, PTO, and a personalized career roadmap for each employee. By investing in professional development through training and educational opportunities, we ensure that our team thrives both personally and professionally. Together, we’re not just building a business; we’re cultivating a community that values creativity, collaboration, and the transformative power of play.
Location: Remote (worldwide)
Employment Type: Full-time
Schedule: 10:00–19:00 (flexible)
Contract: Employment agreement (entity or EOR arranged per candidate location)
Xsolla is dedicated to creating a diverse environment and is proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, language, sexual orientation, national origin, genetics, political beliefs, disability, age, marital status, social background or other characteristics.
We are committed to compliance with all fair employment practices regarding citizenship and immigration status.
If you have questions regarding our hiring practices, please contact careers@xsolla.com.
For more vacancies, visit: xsolla.com/careers
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